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SUPPLEMENTAL FINANCIAL INFORMATION - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue, Major Customer [Line Items]      
Revenue $ 12,515 $ 3,184 $ 1,658
Accounts Receivable, after Allowance for Credit Loss 92 1,858  
Sales Revenue, Net | Customer Concentration Risk | Customer 1      
Revenue, Major Customer [Line Items]      
Revenue 8,778 0 0
Sales Revenue, Net | Customer Concentration Risk | Customer 2      
Revenue, Major Customer [Line Items]      
Revenue 2,592 1,385 0
Sales Revenue, Net | Customer Concentration Risk | Customer 3      
Revenue, Major Customer [Line Items]      
Revenue 0 1,571 1,550
Sales Revenue, Net | United States | Geographic Concentration Risk      
Revenue, Major Customer [Line Items]      
Revenue 9,473 1,721 1,658
Sales Revenue, Net | ESTONIA | Geographic Concentration Risk      
Revenue, Major Customer [Line Items]      
Revenue 2,592 1,385 0
Sales Revenue, Net | Other | Geographic Concentration Risk      
Revenue, Major Customer [Line Items]      
Revenue 450 78 $ 0
Accounts Receivable Benchmark | Customer Concentration Risk | Customer 1      
Revenue, Major Customer [Line Items]      
Accounts Receivable, after Allowance for Credit Loss 0 1,386  
Accounts Receivable Benchmark | Customer Concentration Risk | Customer 2      
Revenue, Major Customer [Line Items]      
Accounts Receivable, after Allowance for Credit Loss 0 367  
Accounts Receivable Benchmark | United States | Geographic Concentration Risk      
Revenue, Major Customer [Line Items]      
Accounts Receivable, after Allowance for Credit Loss 92 472  
Accounts Receivable Benchmark | ESTONIA | Geographic Concentration Risk      
Revenue, Major Customer [Line Items]      
Accounts Receivable, after Allowance for Credit Loss $ 0 $ 1,386